# Trapezoid: 18703

In the ABCD trapezoid: | AD | = | CD | = | BC | a | AB | = | AC |. Determine the size of the delta angle.

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**algebra**- system of equations
- expression of a variable from the formula
**planimetrics**- right triangle
- triangle
- trapezoid
**goniometry and trigonometry**- sine
- cosine

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